本文選題：齒輪傳動 + 混合潤滑�。� 參考：《南京航空航天大學(xué)》2011年碩士論文

【摘要】：諸如齒輪、滾動軸承等高副接觸,因受載接觸變形發(fā)生在很小的面積上,導(dǎo)致接觸區(qū)壓力極高。研究這類接觸的潤滑機理,既需考慮接觸表面的彈性變形,也需考慮其間的潤滑劑粘度變化。綜合考慮以上兩種效應(yīng)的動力潤滑理論稱為彈性流體動力潤滑(Elastohydrodynamic Lubrication)。大部分的齒輪傳動工作在微凸體接觸與流體潤滑共存的混合潤滑狀態(tài)下。本文分析了從光滑表面-粗糙表面接觸、全膜潤滑-部分膜混合潤滑、線-點接觸等彈流潤滑一系列問題,最終建立了漸開線齒輪混合潤滑確定性模型,主要內(nèi)容包括: 分別對線、點接觸光滑表面接觸建立彈流潤滑數(shù)學(xué)模型,編制程序進(jìn)行數(shù)值求解,得出了流體壓力和膜厚分布,得到了二次壓力峰、出口區(qū)“頸縮”現(xiàn)象以及點接觸油膜的“馬蹄形”特征。 利用三種直接迭代解法,對等溫瞬態(tài)粗糙表面彈流潤滑問題進(jìn)行數(shù)值求解,給出了粗糙度影響下全膜潤滑的壓力和膜厚分布,并比較了各直接迭代解法的優(yōu)劣。 對齒輪進(jìn)行幾何參數(shù)以及運動學(xué)簡化,在國內(nèi)首次建立了漸開線直齒輪混合潤滑線接觸確定性模型。將整個齒輪傳動嚙合過程作為一個分析周期,分成多個瞬時并加以連續(xù)求解,得到了齒輪傳動嚙合線上各嚙合點的壓力、膜厚分布。針對光滑表面接觸、考慮粗糙度的全膜潤滑和混合潤滑等不同接觸狀態(tài)進(jìn)行了最大壓力、最小膜厚比較,指出了壓力最大值以及油膜破裂危險點,并考察了功率、轉(zhuǎn)速對最大壓力、最小膜厚的影響。建立了修形齒輪點接觸混合潤滑確定性模型,對嚙合過程中各嚙合狀態(tài)轉(zhuǎn)化點分別進(jìn)行穩(wěn)態(tài)數(shù)值求解,得到了最大壓力、最小膜厚沿嚙合線的分布規(guī)律。
[Abstract]:Such as gear, rolling bearing and other high contact, because the load contact deformation occurs on a very small area, resulting in contact area pressure is extremely high. In order to study the lubrication mechanism of this kind of contact, the elastic deformation of contact surface and the variation of lubricant viscosity should be considered. The dynamic lubrication theory considering the above two effects is called Elastohydrodynamic Lubrication. Most gear drives work in a mixture of microconvex contact and fluid lubrication. In this paper, a series of problems in elastohydrodynamic lubrication, such as smooth surface-rough surface contact, total film lubrication-partial film mixed lubrication, line-point contact, etc., are analyzed. Finally, a deterministic model of mixed lubrication for involute gears is established. The main contents are as follows: the mathematical model of elastohydrodynamic lubrication is established for the smooth surface contact of line and point contact, the numerical solution is compiled, the distribution of fluid pressure and film thickness is obtained, and the secondary pressure peak is obtained. The "necking" phenomenon in the outlet area and the "horseshoe" characteristics of the point contact oil film. The elastohydrodynamic lubrication problem of isothermal transient rough surface is numerically solved by using three direct iterative methods. The pressure and film thickness distribution of the whole film lubrication under the influence of roughness are given, and the advantages and disadvantages of each direct iterative method are compared. The geometric parameters and kinematics of gears are simplified, and the contact deterministic model of involute spur gears with mixed lubrication line is established for the first time in China. The whole meshing process of gear transmission is taken as an analytical period, and it is divided into several instantaneous moments and solved continuously, and the pressure and film thickness distribution of each meshing point on the gear transmission meshing line are obtained. For smooth surface contact, the maximum pressure and the minimum film thickness are compared in different contact states, such as full film lubrication and mixed lubrication, considering roughness. The maximum pressure and the danger point of oil film rupture are pointed out, and the power is investigated. The effect of rotational speed on maximum pressure and minimum film thickness. The deterministic model of modified gear point contact mixed lubrication is established. The steady state transition points of meshing state are solved numerically respectively. The distribution of maximum pressure and minimum film thickness along the meshing line is obtained.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH117.2;TH132.41

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